Do respond immediately to the complaints if they are sent to your host or payment processor, preferably by sending a (redacted?) copy of the model release. If the program won't provide you one, maybe they'll send a redacted copy directly to the host. The DMCA provides you a limited time to respond before the host must take action.
Her complaint is only an actual DMCA notice if she swears under penalty of perjury that she owns tje copyright. If she does not, she's liable for civil damages and if she KNOWS that she doesn't there are theoretically criminal penalties. I don't know of any actual cases so far where criminal penalties have been imposed, but civil penalties have.
http://www.plagiarismtoday.com/2010/...unter-notices/
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